Clean Power Plan, State at a Glance: Maine Page: 1 of 2
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Clean Power Plan: State at a Glance
In the final Clean Power Plan (CPP), EPA is establishing interim and final carbon dioxide emission performance rates for the two
types of electric generating units - steam electric and natural gas fired power plants - under Section 111(d) of the Clean Air Act.
The CPP also establishes state-specific interim and final goals for each state, based on these limits and each state's mix of power
plants. The goals are expressed in two ways-rate-based and mass-based- either of which can be used by the state in its plan.
States that choose a mass-based goal must assure that carbon pollution reductions from existing units achieved under the Clean
Power Plan do not lead to increases in emissions from new sources. EPA is offering an option to simplify this requirement for
states developing plans to achieve mass-based goals. If a state chooses this route, its state planning requirements are
streamlined, avoiding the need to meet additional plan requirements and include additional elements.
EPA has a "goal visualizer" tool on the web at www.epa.gov/cleanpowerplantoolbox that walks through the exact calculations for
Maine's Interim (2022-2029) and Final Goals (2030)
CO2 Rate (lbs/Net MWh) CO2 Emissions (short tons)
2012 Historic 1 873 1,795,630
2020 Projections (without CPP) 736 3,718,956
Mass-based Goal (annual
average CO2 emissions in Mass Goal (Existing) & New
Rate-based Goal short tons) Source Complement
Interim Period 2022-2029 842 2,158,184 2,199,016
Interim Step 1 Period 2022-2024 2 888 2,251,173 2,267,928
Interim Step 2 Period 2025-2027 3 827 2,119,865 2,176,390
Interim Step 3 Period 2028-2029 4 793 2,076,179 2,129,585
Final Goal 2030 and Beyond 779 2,073,942 2,109,968
1. EPA made some targeted baseline adjustments at the state level to address commenter concerns about the representativeness of baseline-year data.
These are highlighted in the CO2 Emission Performance Rate and Goal Computation TSD.
2, 3, 4. Note that states may elect to set their own milestones for Interim Step Periods 1, 2, and 3 as long as they meet the interim and final goals articulated
in the emission guidelines. In its state plan, the state must define its interim step milestones and demonstrate how it will achieve these milestones, as well as
the interim goal and final goal. See section VIII.B of the final rule preamble for more information.
The final Clean Power Plan goals for Maine look different from the proposed goals - the 2030 goal looks less stringent, and the
interim goal looks less stringent.
States' goals fall in a narrower band, reflecting a more consistent approach among sources and states.
At final, all state goals fall in a range between 771 pounds per megawatt-hour (states that have only natural gas plants) to 1,305
pounds per megawatt-hour (states that only have coal/oil plants). A state's goal is based on how many of each of the two types
of plants are in the state.
The goals are much closer together than at proposal. Compared to proposal, the highest (least stringent) goals got tighter, and
the lowest (most stringent) goals got looser.
o Maine's 2030 goal is 779 pounds per megawatt-hour. That's on the low end of this range, meaning Maine has one of the
more stringent state goals, compared to other state goals in the final Clean Power Plan.
o Maine's step 1 interim goal of 888 pounds per megawatt-hour reflects changes EPA made to provide a smoother glide
path and less of a "cliff" at the beginning of the program.
The 2012 baseline for Maine was adjusted to be more representative, based on information that came in during the comment
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United States. Environmental Protection Agency. Clean Power Plan, State at a Glance: Maine, text, August 3, 2015; United States. (digital.library.unt.edu/ark:/67531/metadc949434/m1/1/: accessed November 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.